PULLEY WITH SINGLE-DIRECTION TRAVEL

The pulley (1) comprises two sheaves (2) arranged in line with grooves defining an axis of circulation of a cable (3). A blocker (12) allows the movement of the pulley (1) along the cable (3) in a first direction and prevents the movement of the pulley (1) in a second, opposite, direction. The blocker (12) defines a slot (13) with two opposite lateral walls (12a, 12b) connected by an end wall. The blocker (12) is rotatable between first and second positions. The axis of circulation of the cable (3) separates the two lateral walls (12a, 12b). The first lateral wall (12a) is able to move along the axis of circulation of the cable (3). The rotation of the blocker (12) between the first position and the second position occurs about an axis of rotation passing through the axis of circulation of the cable (3) so as to offset the two lateral walls (12a, 12b) along the axis of circulation of the cable (3).